Keep a record of each knife and sheath, with tags on each item. If/when you go to sell a knife, it is frustrating if you can not match the knife and sheath that go together.
What Tom said about an spreadsheet is an excellent idea. I can not imagine trying to keep track of knives, sheaths and prices without a spreadsheet.
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Rod Brown
RKS 3846
RKCC CM-123
Whether you think you can or can not, you are right.